Not only do you lose an hour of sleep after the clocks move ahead to daylight-saving time this weekend, but you also may be at increased risk for a heart attack, a heart expert claims. "The Monday and Tuesday after moving the clocks ahead ... is associated with a 10 percent increase in the risk of having a heart attack," Martin Young, an associate professor in the cardiovascular disease division at the University of Alabama at Birmingham, said in a university news release. "The opposite is true when falling back in October. This risk decreases by about 10 percent."